William johnson



(No Model.)

W. JOHNSON.

VISE.

Patented May 15, 1883.

FIG]- 2 IJLHEEEEE UNITED ST rns \VILLIAM JOHNSON, OF LAMBERTVILLE, NEW JERSEY.

VISE.

SPECIFICATION forming part of Letters Patent No. 277,570, dated May 15, 1883.

Application filed March 26,1883. (No model.)

To all whom it may concern Be it known that I, WlLLIAM JOHNSON, a citizen of the United States, residing at Lambertville, in the county. of Hunterdon and State of New Jersey, haveinvented certain new and useful Improvements in Vises; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in vises in which screws are used, in conjunction with the jaws to move the same parallel; and the objects of my invention are, first, to provide means by which the adjustments of the.

parts may be easily made and wear taken up second, to make the lower screw adjustable; third, to rotate the nut on the lower screw; fourth, to provide for keeping the tops of the jaws at an even height; and I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure]. is a part sectional and part full view of the vise, when looking at it from the side. Fig. 2 is a full front view Fig. 3, a front view of adjustmentplate; Fig. 4,11 view in the rear of the lowerhalf of back jaw; Fi 5, a front view of the chain-wheel.

Similar letters referto similar parts throughout the several views.

In the vise shown A A are thcjaws; B and B, the upper and lower screws, the screw B being connected to the lower arm of the rear jaw by nut U, and adapted to be moved up or down in slot 7), as desired, when adjustment of the parts is necessary.

E is a nut fitted to screw B, and adapted to convey a movement to the lower arm of the i'rontjaw A equal to the movement given by the upper screw to the upper part of the movable jaw A, the said movement being communicated through the means of plate F, secured to the lower part of movable jaw A and placed in groove 6, formed on the nut E.

In the plate F is formed a slot, f, through which passes a bolt, 0, to secure the plate in proper position.

To the nut E is securely attached a toothed wheel, 1), and to the upper screw, B, is secured a similar toothed wheel, both being conneeted by a linked chain, (1.

Through the head of the upper screw, B, is passed a lever, G, for rotating the screw to open or close thejaws.

To the lower part of the jaw A is secured a rod, H, to support the weight of the vise, and a flange, h, at the upper part of samejaw for holding the vise up to a bench.

From the above description it is obvious that, when the upper screw is rotated to either open or close thejaws, the nut E on the lower screw is also rotated by means of the toothed wheels and chain, and, as the pitch of the screw-threads are equal in both the upper and lower screws, a movement equal in distance will be communicated to the movable jaw at the top and bottom part of the same, and the jaws will remain parallel at all points within the limits of the vise. Should the chain cl at any time become too loose or too tight, it can be properly adjusted by moving the screw 13 either up or down in the slot 1) and securing the same by nut C.

It will he observed that, as the lower screw is held immovable, it forms a support and guide for the movable jaw, and by the use of the slotted plate F, attached to the movable jaw, the jaws at the top may be kept at an even height by the adjustment of said plate.

In describing the above vise I do not limit myself to the exact construction shown, for it is evident that both upper and lower screws may be attached to the fixed jaw and held stationary, while the nutboxcs olboth screws are revolved. 'llherei'ore \Vhat I desire to claim and secure by Letters Patent is- 1. A vise having a tired and a movable jaw, connected by two screws, one ol' which is secured lo the fixed jaw and acts as a support for the movable jaw, as and for the purpose set forth.

2. A vise having a fixed and an adjustable screw connected by a chain, whereby the tension on chain may be adjusted, as and for the purpose set forth.

3. A vise having two screws, one of which is adjustably connected to the liked jaw, as and for the purpose set forth.

4. A vise in which the jaws are operated through the means of screws acting in fixed justable screw, and an adjustable bearing-plate and movable nuts, as and for the purpose set on the movable jaw, as and for the purpose forth.

5. A vise having fixed and movable screws,

5 combined with fixed and movable nuts acted upon by a chain, as and for the purpose set forth.

6. A vise having two screws, one fixed and the other adjustable on the fixed jaw, to anti 10 from the fixed screw, a movable nut on the adset forth. 4

In testimony whereof I have affixed my signature in presence of two witnesses.

WILLIAM JOHNSON.

Witnesses:

CHAS. W. BURIN, J. HAYHURST. 

